The union
"S"
features the
connection
with
the
return line. The
quantity
of
the pressure
oil
which
circulates through the metering gear set is pro-
portional
to
the
number
of
turns
of
the
steering
wheel. The
piston
is pushed proportic,nal
to
the
quantity
of
oil
which
enters the hydraulic ram, in
the space
"S,",
then
the
oil
from the space
"0,"
passes
to
the tank.
When steering wheel turning stops, the rotary-
distributor
spool and the steering
control
are
brought back in neutral position.
RIGHT TURN
The steering wheel
is
turned
to
the right; the
metering gear set opens the pressure
oil
circula·
tion
to
the steering ram
(6),
through the union
"0".
The union
"S"
features the
oil
return.
TURNING WHEN THE OIL PUMP IS IN·
OPERATIVE
In
this
case, steering wheel
turning
requires a
higher effort. To turn the steering wheel,
the
distributor
spool
must
leave the neutral
position
and the same pressure
circulations
like when the
pump is operative, are established.
The union from the pump
"P"
is pressureless,
the non-return valve
(15)
is c.losed and the meter-
ing gear set is revolving due
to
the
effort
on the
steering wheel.
The metering gear set operates like a
pump
which sucks the oil from the return line, through
the non-return valve
(16)
and
directs
it
to
t~e
union
"0".
The
effort
on
the
steering wheel
is
highly
increased due
to
the resistance felt when
turning the tractor.
SERVICING THE HYDROSTATIC STEERING
SYSTEM
RESERVOIR (TANK)
When
filling
the reservoir
with
oil,
the
following
procedure should be used;
1.
Raise
the
front
wheels
off
of
the
ground.
2.
Fill
the
reservoir
to
maximum level, and
replace
filler
plug.
3.
Turn
the
engine for a maximum
of
10
seconds, using
the
starter,
but
do not start
the
tractor.
4.
Re-fill
the
reservoir, and replace
filler
plug.
5.
Start
the
engine and run it at an idle; turn the
steering wheel one full turn to the left, and
then one
full
turn
to
the
right, avoiding the
extreme
position
in
either
position.
6.
Repeat
operations
"2"
and turn the steering
wheel several
times
in both directions, keep·
ing
it
in
its
extreme
position
for only a few
seconds.
7.
Top the reservoir and
lower
the tractor. Turn
the
steering wheel several
times
in both
directions,
observing the operation
of
the
steering system.
STEERING UNIT
The steering
unit
can be serviced
only
by the fac-
tory, therefore,
it
must
be replaced as a
unit
when damage
or
malfunction
is observed.
To replace
the
steering unit, remove the instru-
ment panel and
disconnect
the
steering
column
from
the
steering unit. Disconnect pipes
to
the
unit, and remove
unit
from support bracket.
Install new unit, and replace pipes in proper loca-
tion. Replace steering
column
and instrument
panel.
Refill reservoir as
outlined
above.
Hydraulics •
181
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